I'm going to file for AOS soon. Without any lawyers, of cause.
The procedure is standard. And I have no special circumstances that require to have a lawyer.
I changed from one non-immigrant status to another before. Without any "attorney". All you have to do is to follow the order and read instructions carefully.
Do you know that attorneys charge about $1000 for fillling out I-140 and another $1000 for I-495. Can you tell me, what is so difficult about filling out I-495?
Or I-131, I-765 (about $500 charged by "lawyers"). Is it difficult to fill out those correctly?
Or mayby G-325A looks difficult to you? Well, then you need an attorney.
But I don't need one.
In fact, most of the paperwork in attoneys offices is done by paralegals, who work for $10/hr.
Your attoney will neigher help you to get your VisaScreen certificate or pass medical examination, nor will be able to accelerate FBI name check.
Rules are the same for everybody, regardless of if they have an attorney or not.
Many liers..., sorry I mean lawyers, are not doing their job right and in the timely manner. And in the real life it's not like in the movie, where the attorney is like a magician, who makes the impossible possible. On this forum you can find many cases of lawyers' negligence and unethical behavior toward their customers.
Here is one example for you:
http://boards.immigrationportal.com/showthread.php?t=125789&highlight=lawers+money
And here is one more:
http://boards.immigrationportal.com/showthread.php?t=194143&highlight=lawyer+RFE+money
Here people share experience about getting green card through marriage without any lawyers:
http://boards.immigrationportal.com/showthread.php?t=191615&highlight=lawyer+increase+fee
And this is a reason why immigration forums exist. To share the information. Not for advises like: "go to the attorney immediately!".
Good luck!